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Method for refining hypereutectic aluminum-silicon alloy primary crystal silicon tissues

An aluminum-silicon alloy and hypereutectic technology, applied in the field of metal casting, can solve the problems of energy consumption, limited effect, increase process cycle, etc., and achieve the effects of reducing stress concentration, refining eutectic silicon and uniform distribution

Inactive Publication Date: 2012-02-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is found that the overheating of the melt can refine the primary silicon to a certain extent, the disadvantage of the process method is that the selection of the overheating temperature is blind, so the degree of refinement of the silicon crystal is limited. For Al-Si16% overheating treatment Afterwards, it can only reach about 20-30 μm under the condition of rapid cooling, and the refinement and shape of the primary silicon of the Al-Si alloy containing Si17.42% are very unsatisfactory (Nonferrous Metals, (2002) Volume 54, Phase 3, No. 19-21 pages)
This process has a good effect on refining primary silicon, but requires additional heat treatment equipment, increases the process cycle and consumes a lot of energy
[0009] 5. Other methods include: electromagnetic stirring (Material Science and Technology (2001) Volume 9, Phase 2, No. 117-121), ultrasonic treatment (journal of materials processing technology 208 (2008) 330-335), rapid solidification, etc., but It is still technically difficult to apply to actual casting production, and the effect is limited

Method used

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  • Method for refining hypereutectic aluminum-silicon alloy primary crystal silicon tissues
  • Method for refining hypereutectic aluminum-silicon alloy primary crystal silicon tissues
  • Method for refining hypereutectic aluminum-silicon alloy primary crystal silicon tissues

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation method is as follows:

[0055] Add the aluminum-silicon alloy raw materials to the melting furnace for mixing, raise the temperature to 760°C and melt for 30 minutes. After melting, detect the composition and adjust it to the required alloy composition. Then keep the temperature constant and refine the alloy liquid with hexachloroethane for 20 minutes. In order to remove hydrogen and non-metallic inclusions, the alloy liquid is heated to 1080°C and maintained for 30 minutes, then cooled to 950°C, and refined with argon for 5-7 minutes to remove gases and oxidized inclusions. Lower the temperature to 760°C, and cool at a cooling rate of 10°C / s after pouring to obtain a hypereutectic aluminum-silicon alloy casting.

Embodiment 2

[0057] The preparation method is as follows:

[0058]Add the aluminum-silicon alloy raw materials to the melting furnace for mixing, heat up to 760°C for 30 minutes, detect the composition after melting and adjust to the required alloy composition, refine the alloy liquid with hexachloroethane for 20 minutes to obtain the alloy liquid, so as to remove Hydrogen and non-metallic inclusions, the resulting alloy liquid is poured and cooled at a cooling rate of 10°C / s to obtain a hypereutectic aluminum-silicon alloy casting.

Embodiment 3

[0060] The preparation method is as follows:

[0061] Add the aluminum-silicon alloy raw materials to the melting furnace for mixing, heat up to 760°C for 30 minutes, detect the composition after melting and adjust to the required alloy composition, refine the alloy liquid with hexachloroethane for 20 minutes to obtain the alloy liquid, so as to remove Hydrogen and non-metallic inclusions, the alloy liquid is heated to 950°C and maintained for 30 minutes, then refined with argon for 5-7 minutes to remove gas and oxidized inclusions, cooled to 760°C under the protection of the covering agent, and cast Afterwards, the hypereutectic aluminum-silicon alloy casting is obtained by cooling at a cooling rate of 10° C. / second.

[0062] The comparative analysis of embodiment 1-3:

[0063] In the case of pure melt superheating process, the effect of effectively refining primary silicon can only be obtained after the melt structure and property state have really changed. image 3 with ...

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Abstract

The invention discloses a method for refining hypereutectic aluminum silicon-alloy primary crystal silicon tissues, which is characterized in that high-temperature alloy melt bodies after being subjected to qualitative change and structural state change and low-temperature alloy melt bodies in the specific semi-solid temperature region are mixed and melt according to the mass ratio of 1 / 1 to 2 / 1, the mixed alloy melt bodies are obtained, the temperature of the mixed alloy melt bodies is reduced to 720 to 750 DEG C under the protection of covering agents, and hypereutectic aluminum-silicon alloy castings are obtained after casting and temperature-reduction solidification. The method has the advantages that the addition of leavening agents is not needed, the serious pollution on production and social environments caused by the use of the ordinary leavening agents is avoided, the average dimension of primary crystal silicons can be refined from about 50mum to 11-13mum under the faster cooling condition (8 to 10 DEG C / s) of the ordinary casting, in addition, the distribution tends to be uniform, and silicon crystal grain corners are passivated.

Description

1. Technical field [0001] The invention relates to a metal casting method, in particular to a method for refining the primary silicon structure of a hypereutectic aluminum-silicon alloy. 2. Background technology [0002] Hypereutectic Al-Si alloy has good wear resistance, thermal stability, low thermal expansion coefficient, high thermal conductivity, excellent casting performance and welding performance, and has been considered as an ideal wear-resistant and heat-resistant functional alloy material. It has great application prospects in aerospace industry, auto parts manufacturing, railway transportation industry, military industry, electronic industry and internal combustion engine piston manufacturing industry and other fields. However, in the microstructure of hypereutectic aluminum-silicon alloy materials obtained under conventional casting conditions, the primary silicon is in the form of slabs, polygonal blocks or five-lobed stars, and the shape and distribution are p...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/06C22C21/02
Inventor 祖方遒陈忠华韩严法席赟黄中月刘兰俊
Owner HEFEI UNIV OF TECH
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